A regional survey of 561 companies asked the vice president of operations how satisfied he or she was with the software support received from the computer staff of the company. Suppose 187 of the 561 vice presidents said they were satisfied. What is the 99% confidence interval for the proportion of the population of vice presidents who would have said they were satisfied with the software support if a census had been taken?

Q: 3- Car and Driver Magazine tested a random sample of 9 hybrid cars and found their MPG to be 42, 51,…

A:

Q: If a retailer would like to estimate the proportion of their customers who bought an item after…

A: Given data,     P=58%=0.58     E=7%=0.07     z-value at 95% confidence is  zc =1.98     n=?

Q: 12. In a sample of 600 Canadians, 265 say they would rather retire in the US than in Canada.…

A:

Q: A political candidate has asked you to conduct a poll to determine what percentage of people support…

A: Sample size:The minimum sample size for a desired confidence level, α with a given margin of error,…

Q: In your work for a real estate company, you find that in a sample of 1762 home buyers, 722 found…

A: Given Data: x=722 n=1762   p^=7221762=0.4098

Q: When 460 junior college students were surveyed, 100 said they have a passport. Construct a 95%…

A: Given that there are 460 junior college students and 100 said they have a passport. That is, n=460…

Q: A political candidate has asked you to conduct a poll to determine what percentage of people support…

A: In this question, It has been given that Margin of error = 0.05 and level of significance = 0.005.…

Q: A political candidate has asked you to conduct a poll to determine what percentage of people support…

A:

Q: b. In the year 2000, a survey of 1189 U.S. adults were asked who they felt was the greatest…

A: Given,n=2000x=331p^=xnp^=3312000=0.16551-p^=1-0.1655=0.8345α=1-0.90=0.1α2=0.05Z0.05=1.645…

Q: Based on a random sample of 400 voters in which 285 said they favored the idea of a new city…

A: Given: n = 400 x = 285 Confidence level = 97%

Q: In a recent poll, 430 people were asked if they liked dogs, and 41% said they did. Find the margin…

A: It is given that the value of n is 430, p hat is 0.41 and the confidence level is 0.99.

Q: Political survey- A political analyst found that 43% of 300 randomly seleted republican voters feel…

A: It is given that p hat is 0.43 and sample size is 300. The confidence level is 0.95.

Q: 1. A consumer watch group interviewed a random sample of 1000 consumers and asked them if they are…

A: Here use confidence interval for population proportion

Q: In a recent poll, 560 people were asked if they liked dogs, and 22% said they did. Find the margin…

A: For 95% confidence intervalα=1-CI=1-0.95=0.05So, zα2=z0.052=z0.025=1.96

Q: If n=160 and ˆp (p-hat) =0.48, find the margin of error at a 99% confidence level

A: Given Data: p^=0.48n=160   We know that, p^-pp^(1-p^)n~ Normal(0,1)

Q: In a survey of 50,00 people, 80% indicated that they listened to their favorite radio station…

A: Hern= 5000 P^ = 0.80 We have to construct 95% ci for p

Q: Of 380 randomly selected medical​ students, 21 said that they planned to work in a rural community.…

A: Given that 380 randomly selected medical​ students, 21 said that they planned to work in a rural…

Q: A political candidate has asked you to conduct a poll to determine what percentage of people support…

A:

Q: A research institute poll asked respondents if they felt vulnerable to identity theft. In the poll,…

A: (a). Find the best point estimate of the population proportion p: It is given that, in a poll of n =…

Q: a research poll institute asked respondents if they fet vulnerable to identify theft. in the poll,…

A: Given Data: n=1002 x=595 α=0.05   Calculating the sample proportion p⏜=xn=5951002=0.5938 As n is…

Q: In September 2011, Gallup surveyed 1,004 American adults and asked them whether they blamed Barack…

A: It is given that sample size (n) is 1004 and p-hat value is 0.53.

Q: In a recent poll, 150 people were asked if they liked dogs, and 55% said they did. Find the margin…

A:

Q: In a recent poll, 240 people were asked if they liked dogs, and 32% said they did. Find the margin…

A: Find z-critical value:…

Q: A research institute poll asked respondents if they felt vulnerable to identity theft. In the​ poll,…

A: Given , n = 1008 x = 598

Q: 6. A consumer watch group interviewed a random sample of 1,000 consumers and asked them if they are…

A: Hi! Thank you for the question, As per the honor code, we are allowed to answer one question at a…

Q: In a recent poll, 260 people were asked if they liked dogs, and 67% said they did. Find the margin…

A: Given: p = 67%=0.67 n= 260 The value of z at a 90% confidence level is 1.645, which can be found by…

Q: In a previous election, the confidence interval for the proportion of likely voters who would vote…

A: given;confidence interval for the proportion;(0.4401, 0.5199)i.e. (p^-E, p^+E)where  p^ : point…

Q: A political candidate has asked you to conduct a poll to determine what percentage of people support…

A: The formula for the sample size is as follows:

Q: Of 254 randomly selected medical students, 25 said that they planned to work in a rural community.…

A: It is given that, the number of students said that they planned to work in natural community   (x)…

Q: A research institute poll asked respondents if they felt vulnerable to identity theft. In the poll,…

A:

Q: A political candidate has asked you to conduct a poll to determine what percentage of people support…

A: Obtain the sample size of a no preliminary estimate for p. The formula of sample size is, Here,…

Q: A survey of 300 union members in New York State reveals that 112 favor the Republican candidate for…

A:

Q: 4. The manager of University Credit Union (UCU) would like to know what proportion of her customers…

A: According to the given information, we have Total number of customers = 400 Given that 271 of the…

Q: 1. In a poll of 2,500 likely voters, 966 say that the Philippines spend too little on education.…

A:

Q: 3. Aresearcher wants to estimate the daily expenses of college students. He wants a 99% confidence…

A:

Q: A survey​ asks, "If the husband in a family wants​ children, but the wife decides that she does not…

A: We have to create 99% confidence interval for the population proportion.

Q: A survey of 300 union members in New York State reveals that 112 favor the Republican candidate for…

A:

Q: A research institute poll asked respondents if they felt vulnerable to identity theft. In the poll,…

A: Given data n=1026 x=520 confidence interval=95%

Q: In a survey of 32 students at a local high school, 17 support changing the schools mascot. Find the…

A:

Q: b. Construct a 90% confidence interval for the percentage of all judges who are in favor of the…

A: a. A random sample of 15 judges and asked them whether or not they favor the death penalty in which…

Q: university dean is interested in determining the proportion of students who receive some sort of…

A:

Q: In a recent poll, 410 people were asked if they liked dogs, and 44% said they did. Find the margin…

A: n = 410 p^=0.44 Confidence interval = 95%

Q: A political researcher takes a survey of 310 randomly selected registered voters in Orlando, and…

A:

Q: When 258 college students are randomly selected and surveyed, it is found that 106 own a car. Find a…

A: The provided information is: It is given that 106 college students (s) own a car among 258 college…

Q: confidence interval for the true proportion

A: We have to find out the confidence interval for the true proportion.

Q: ays before the 2016 presidential election, a Loras College poll asked 500 randomly selected likely…

A: The confidence interval indicate that true proportion of voters who favor Donald Trump is 43% which…

Q: In a past presidential election, 36,523,493 people voted for Candidate A; 36,417,321 for Candidate…

A: The appropriate interpretation is to be made considering the proportion of votes for candidate A.

Q: Of 380 randomly selected medical students, 21 said that they planned to work in a rural community.…

A: Here we need to construct a 95% confidence interval for the population proportion. Here the sample…

Q: A research institute poll asked respondents if they felt vulnerable to identity theft. In the poll,…

A: Given, The sample proportion is,

Q: A political candidate has asked you to conduct a poll to determine what percentage of people support…

A: Given dataError = 2.5% = 0.025Confidence level = 0.995Significance level = α=1-0.995=0.005

Types of Bias

Statistics is the study of data collection, organization, analysis, interpretation, and presentation. Statistical bias is a characteristic of a statistical technique or its findings in which the expected value deviates from the actual root quantitative parameter being estimated. According to the actual definition of bias, it refers to the tendency of a statistic to overestimate or underestimate a parameter.